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If your vet is seeing small items or possible foreign bodies in the intestines, it may be that Felix has an intestinal obstruction. This can lead to fever and anorexia. If it is not passing through the intestine, Felix may need surgery to have that removed in order for his symptoms to resolve. If you vet is unsure if this is the problem, sometimes xrays taken after a barium swallow will help to outline the obstruction.
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